Extractor fans that don't need a fuse

[SparkyChick]

Hi all,

I've been trying to find fans that don't require fusing down according to the instructions.

Can anyone recommend any please?

These are just replacements and I'm trying to keep the cost down for the customer so if I can avoid extra work to install fuses etc. I'd like to.

Thanks

SC

 

[johnduffell]

Are they run off a 6A lighting circuit? I know it doesn't answer your question, but EDIT I think I misremembered - 3A fuse operates quicker than 6A MCB for overload currents - 7A would blow a 3A fuse in 0.05 seconds but would take 3600 for the 6A MCB to trip.
However although there's no need to follow the manufacturer's instructions, life is probably easier further down the line if you don't have to explain that.

 

[Octopus]

S&p

Greencroft

Are 2 that spring to mind

 

[Ian1981]

The only time I fuse down a fan is if it’s spurred from a ring circuit. If it’s fed from a lighting circuit then it’s usually protected by a 6 amp mcb so as already said the mcb will most likely trip before the fuse ever blows

 

[SparkyChick]

S&p

Greencroft

Are 2 that spring to mind

Thanks Murdoch. Found the S&P ones, any chance you could point me in the direction of the other one as I can't seem to find it on-line.

Thanks

 

[Octopus]

Thanks Murdoch. Found the S&P ones, any chance you could point me in the direction of the other one as I can't seem to find it on-line.

Thanks

Greenwood

Sorry

But it’s daft this 3a fuse thing .....

 

[SparkyChick]

Greenwood

Sorry

But it’s daft this 3a fuse thing .....

Thanks

And yes, it's a pain in the posterior. It's alright saying it's only guidance, but who amongst us fancies their chances arguing the ---- with someone in court? Personally, I don't, so I prefer to follow the MIs, it's just an excuse to off-load their responsibilities.

 

[Octopus]

I took this 3A issue up with icon .... needless to say they wouldn’t budge ....... 6A MCB versus 3A 1362 ..... just goes to show how little manufacturers know .. and understand

 

[Wilko]

Hi - here's one I used a while back. It's Vent Axia, but I don't think all their 100mm models have their own internal fuse like this one, which is why I took a pic .

 

[johnduffell]

I took this 3A issue up with icon .... needless to say they wouldn’t budge ....... 6A MCB versus 3A 1362 ..... just goes to show how little manufacturers know .. and understand

I thought the same from memory but after checking it doesn't seem to apply to overload current. Do manufacturers specify a 1362 fuse for overload protection eg shorted windings as well?

 

[123]

Vortice

Envirovent (the Silent 100 is an absolutely cracking fan, far better extraction rates than any other 100mm Axial fan I've come across)

 

[Andy78]

Hi - here's one I used a while back. It's Vent Axia, but I don't think all their 100mm models have their own internal fuse like this one, which is why I took a pic .

View attachment 45444

Hard to see but is the fuse soldered onto the pcb or is it replaceable ?

 

[Andy78]

Envirovent are very good fans. They are another trading name for S&P. Same fans.

 

[SparkyChick]

Hard to see but is the fuse soldered onto the pcb or is it replaceable ?

It's a lead ended axial, soldered onto the PCB. Replaceable if you can wield desoldering gear

Edit - But to be fair, if it fails I suspect the fans a write off.

 

[Andy78]

It's a lead ended axial, soldered onto the PCB. Replaceable if you can wield desoldering gear

Edit - But to be fair, if it fails I suspect the fans a write off.

My fat fingers and poor eyesight would see me replacing the fan

 

[SparkyChick]

Thanks chaps, got some choices I'm liking the S&P/Envirovent ones. Guess I'll just have to skip the part in the instructions about having an isolator with 3mm contact gap... that would be the main switch in the CU

 

[Andy78]

Fused fan isolator if you need ......

Excel 3 Pole Fused Fan Isolator Switch - White | QVS Direct - https://www.qvsdirect.com/excel-3-pole-fused-fan-isolator-switch-white?gclid=Cj0KCQjwjvXeBRDDARIsAC38TP5ZRzR4QHnsjOkHbN-H4zGAlR_Lztn6jQwh60_k3q3bWmrIeq71GHkaAhbjEALw_wcB

 

[happysteve]

As Wilko's already said (just a bit more info): Vent-Axia Silhouette 100T (for timer model), model no 454055. Link to manufacturer's instructions:
https://www.vent-axia.com/sites/default/files/449631.pdf

Most of their other fans they do specify 3A fuses, but not this one.

 

[Wilko]

Hard to see but is the fuse soldered onto the pcb or is it replaceable ?

Soldered in - I guess they're thinking if the internal fuse blows it's kaput

 

[Wilko]

... Guess I'll just have to skip the part in the instructions about having an isolator with 3mm contact gap...

Shouldn't be a problem, as fan isolators should meet this. Anything with the symbol nicely shown on the pic will be ok, so will plenty of others. It may be possible to find a 3 pole fan isolator for sale that doesn't meet the standards listed in Table 537.4 , but I hope not.

 

[SparkyChick]

Thanks Wilko (and Andy) for linking the fan isolators... as I say, I'm trying to avoid any changes to the fixed wiring.

 

[Ian1981]

Deleted post

 

[TJ Anderson]

Excel 3 Pole Fused Fan Isolator Switch - White | QVS Direct - https://www.qvsdirect.com/excel-3-pole-fused-fan-isolator-switch-white?gclid=EAIaIQobChMIs42W2qy63gIVbrHtCh1NNAKuEAQYASABEgIzvvD_BwE

I see you can get these.

Problem is though, the fuse is only going to be in series with one switch pole. So, unless im missing something, only one of the line conductors will be fused (switched or permanent), the other will still only be be covered by circuit mcb only.

 

[Wilko]

Hi TJ - these are made as 2 separate units, so you can bring unswitched L to the fuse then take Lfused to the fan (via one isolator pole), another Lfused to the light switch and back to fan (via next isolator pole) to give Ls and N (via 3rd pole) as usual. Ha - where's a good drawing?

 

[TJ Anderson]

Hi TJ - these are made as 2 separate units, so you can bring unswitched L to the fuse then take Lfused to the fan (via one isolator pole), another Lfused to the light switch and back to fan (via next isolator pole) to give Ls and N (via 3rd pole) as usual. Ha - where's a good drawing?

Ah...I see . Only good for new install then or otherwise making wiring changes to accommodate it.

 

[Wilko]

Yes, it's a bit of a fuss. I'd rather find the right fan

 

[a-z electrics]

I know they're pricier but S& P are good fans. Quiet and superior extraction on 4 inch vent. 5 inch ones not cost much more for twice the extraction rate too..
I always tend to fit these as first choice now..

 

[a-z electrics]

Another thing is you can get a fuse incorporated with the 3 pole switch too. A lot neater and cheaper thsn fitting an ectra fcu. Click do them..

 

[Baddegg]

Another thing is you can get a fuse incorporated with the 3 pole switch too. A lot neater and cheaper thsn fitting an ectra fcu. Click do them..

Thinks those only fuse the permanent line though?......

 

[a-z electrics]

Thinks those only fuse the permanent line though?......

Probably right..

 

[ipf]

Thinks those only fuse the permanent line though?......

Is that correct? I don't know.
I may be wrong but, without testing, something tells me it could be dangerous......the fan doesn't run on yet the unit is still live with the switch in 'on' position.
In other words, the fuse isn't fully isolating the unit.

 

[richy3333]

No, if switched off the there is nothing live on the fan/load supply side, just like a DP switch. Only line is fused and isolated by the switch when you wire one - as per the diagram manufacturers usually supply with their fan instructions